AccScience Publishing / MSAM / Volume 5 / Issue 1 / DOI: 10.36922/MSAM025260055
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ORIGINAL RESEARCH ARTICLE

Effect of hot isostatic pressing on the microstructure and mechanical properties of porous Ti-6Al-4V alloy manufactured by laser powder bed fusion

Marketa Strakova1* ,  Jiri Kubasek1 ,  Jonas Divin1 ,  Jan Pinc2 ,  Dalibor Vojtech1
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1 Department of Metals and Corrosion Engineering, University of Chemistry and Technology, Prague, Czech Republic
2 FZU - Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic
MSAM 2026, 5(1), 025260055 https://doi.org/10.36922/MSAM025260055
Received: 27 June 2025 | Accepted: 11 August 2025 | Published online: 13 October 2025
© 2025 by the Author(s).. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )
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Abstract

Laser powder bed fusion (LPBF) enables the production of Ti-6Al-4V alloys with tailored porous structures, which are beneficial for biomedical applications due to their reduced elastic modulus and enhanced bone integration potential. This study examines the effect of hot isostatic pressing (HIP) on the microstructure and mechanical properties of diamond and gyroid porous structures fabricated by LPBF. Solid tensile specimens served as reference materials. HIP significantly reduced porosity, decreased ultimate tensile strength and hardness, but markedly increased ductility (from 6% to 17%). Compressive strengths reached approximately 100 MPa (diamond) and 240 MPa (gyroid), with HIP causing only a slight increase in strain. However, HIP notably improved bending performance, raising the flexural strength of gyroid structures from 280 MPa (as-printed) to 340 MPa (post-HIP). The strength of LPBF-fabricated Ti-6Al-4V porous structures is reduced by HIP, but their ductility and bending performance are enhanced, making them more suitable for biomedical applications.

Graphical abstract
Keywords
Ti-6Al-4V
Laser powder bed fusion
Hot isostatic pressing
Porous material
Mechanical properties
Lattice structures
Funding
This work was supported by the project “Mechanical Engineering of Biological and Bioinspired Systems” (Project No. CZ.02.01.01/00/22_008/0004634) funded by “Programme Johannes Amos Commenius,” Excellent Research Call. It was also supported by the Ministry of Health of the Czech Republic in cooperation with the Czech Health Research Council (Project No. NW25-08- 00044). The authors also acknowledge the grant of Specific University Research (Grant No. A1_FCHT_2025_011).
Conflict of interest
The authors declare that they have no competing interests.
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Materials Science in Additive Manufacturing, Electronic ISSN: 2810-9635 Published by AccScience Publishing
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